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0. A. WIIBERG AND s. MfBKCKS TRUMI FLUID PRESSURE TURBINE.

. Patented Oct. 7,1919.

APPLICATION FILED MAY 9. 1917.

v STATES, PATENT orrucs.

05cm ANTON simian mums nficxsrnornor rnisronc, SWEDEN,

assxenons, BY. mnsitfi ASSIGNMENTS, T0 axrmnomenr munesrmous runnm, or 'sroormorm, swsnnn, A CORPORATION.

rnnm r'nnssmm TURBINE.

To all whom it may comm Specification of Letters Patent.

Application filed May 9, 1917, Serial 30. 167,587:

Wrasse and Sretnu) MA'rrIAs Bllcnsrnrr, sub]eets of the hang of Sweden, (whose post-' office addresses are Finspon Sweden,) have invented new and useful mprovements in Fluid-Pressure Turbines, of which the fol-' lowing is a specification. I i I This invention relates to fluid pressure turbinesffor instance steam and gas turbines, for large amounts of power, and

.moreespecially to the disks. of such turbines, carrying the blade or vane rings.

One application of our invention is'in connection with the disks of radial flow or combined radial and axial 'flow turbines and in the followingspecification it is specifi-- cally described in this conn'ectioxn It will be understood, however, that the invention is 'not necessarily limited thereto.

The disks of radial flow or combined radial and axial flow turbines carrying the blade rings are generally divided into concentric sections connected by means of expansion rings. The objectof such division is to prevent the stresses and deformations, whichwonld occur in a solid disk exposed to the varying and unequally distri u'ted temperatures existing during the running of the turbine at different distances from the inlet. Besides, said division also facilitates,

to-a certain extent, the manufacture and hardening of the turbine disks; Such a.

division has, however, been found not to be sufiicient in the turbine disks of very lar e turbines, since the sections of the disk W111 be so large that it is very difficult to heat and harden said-sections in such mannerthat the material of the core of the section obtains the required strength.

. The object of the present invention is to provide an improved disk or disk structure wherein the above referred to difiiculty is prevented or overcome and for a considera-' tion of Wh3,l3 We believe to be novel and our invention, attention is directedto the 01- pended thereto.

lowing specification and the claims ap- In carrying out our invention .we construct a turbine disk or, in case the disk is formed in two or more disk sections, one or more of such disk sections of a plurality of separate concentric annular ring'srigidly itted to each other. Preferably a disk or disk ANG- Paten tea oat. v. 1919,

section constructed according to our invention comprises an inner ring which forms-av hub of t e disk or disk section and which has formed integral there-with a core or web and-serve to strengthen the core. These rlngs maybe rigidly connected by shrinkingand a plurality of concentric rings which surround the hub on each side of the core or in other suitable manner. Bythis means the cores and the rings will be'of comparatively small cross section so that they may be heated and hardened in a manner most fit for turbine disks. At the'same time the completed disk or disk section will have the necessary size and strength to withstand the stresses torwhich it ma "besubjected,

An illustrative embo iment of our invention applied to turbine disks of radial steam turbines is by way of example, represented .in the accompanying drawing in which- 1 Figure 1 shows in a substantially diagrammatic manner a partial section of a radial turbine having-doubleblade systems rotating in opposite directions, the outer d1sksections carrying axial blades and being constructed in accordance with the invention. Fig. 2 is a cross-section on a larger in swell-known manner composed of sections 1 and 2 interconnectcdby: means of expansion rings 3.- The sections 1 and 2 support, as usual,- seriesof-radial flow blade rings 4 and 5 respectively and, besides, each of the sections 2 is provided with a ring of.

axial flow blades '6.- Owing thereto the outer sections 2 will be ei posedto heavy stresses, and in 'order to give the said sections 9. suflicient strength they are, according'to' the invention, further divided concentrically, said sections being composed of, a core member 21 and strengthening rings, 22, 23, 24 and 25 shrunk on said core mem-i her or connected therewith in any other suitable-manner. By this division 8. too large. cross-section of the disk section 2 is prevented, which would render the heatin and hardening of said section diflicult. 11 they embodiment shown in F1g 2 the corcmem rings 22m 25 inclusivefare placed at each side of the web of the core member. This bar 21" is T-shaped, and the strengthening form may, however, be varied according to the circumstances.

The invention-may also be applied to turbine disks carrying only axial blades. I

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is; 1. In a fluid pressure turbine, a blade carrying member comprising a core and a plurality of strengthening rings located on each side of the core.

2. In a fluid pressure turbine, a blade carrying member comprising a plurality of concentric sections .-and expansion ring-- means connecting said'sections together, at least one of said sections comprising a plurality of concentric annular rings rigidly fitted to each other.

3. In an elastic fluid turbine, a blade carrying member comprising an inner ring "forming a hub, a web member integral therewith, and annular rings which surround said hub on each side of the web member.

4. In a fluid pressure turbine, a blade carrying member comprising a core and a number of strengthening rings connected with saidcore.

5. In a fluid pressure turbine, a blade "carrying member divided into sections, some of said sections consisting of a core and a number of strengthening rings connected to said core. v

Intestimony whereof we have signed our names.

OSCAR ANTON WIBERG.

SIGURD MATTIAS BKGKSTROM. 

